Gasket type orifice

Patent Granted An orifice changeable pressure type flow controller capable of easily changing a control flow by easily changing an orifice without disassembling and assembling the flow controller. In the flow controller (A), the valve body (23) of a control valve (2) is disposed between an inlet side mounting block (39) having a connection part for a fluid feed pipe and an outlet side mounting block (43) having a connection part for a fluid takeout pipe, and the fluid inlet side of the valve body (23) is releasably connected airtight to the inlet side mounting block (39) and the fluid outlet side of the valve body (23) is releasably connected airtight to the outlet side mounting block (43) to form a flow passage allowing gases to flow therein through the control valve (2)